Can i give hs exam again even when i pass in every subjects? As i am not satisfy with my number and for my dream career i have to improve my number .

Many boards in India offer "improvement exams" or "reappear exams" for students who want to improve their scores in specific subjects.

You would typically take the exam again only for the subjects you want to improve.Check with your specific exam board (e.g., CBSE, ISCE, State Board) for eligibility criteria and application procedures.
These details are usually available on their official websites.There might be deadlines to register for the improvement exam.You might have to pay a fee for each subject you reappear for.In some cases, the improved score might be considered for future applications, while your original passing score might be retained on your mark sheet.

If your dream career has specific entrance exams, you can focus your efforts there.

Performing well in entrance exams can sometimes supersede high school scores for certain programs.

https://school.careers360.com/download/ebooks/10-best-tips-score-90-in-cbse-10th-maths-exam

I hope it helps!